Halloween events in O Fallon

Name: Trunk N Treat
Start: 2026-10-17
End: 2026-10-17
Location: O'Fallon, Missouri

Check out happening halloween events all around O Fallon, MO

4 upcoming events O Fallon, United States Updated 18 Sep 2026

All 4 events in O Fallon

Sat, 10 Oct at 10:00 am 101 Sheriff Dierker Ct, O'Fallon, MO, United States, Missouri 63366

HALLOWEEN

Sat, 24 Oct at 05:00 pm 1 Club Way Dr, St Peters, MO 63376-8000, United States

TRUNK-OR-TREAT

Wed, 23 Sep at 05:30 pm 320 Sonderen St., O'Fallon, MO

Sat, 17 Oct at 05:00 pm O'Fallon, Missouri